Process for dyeing furs, skins, hairs, feathers, or the like



Patented May 5, 1925.

UNITED STATES PATENT OFFICE,

PAUL ON'NERTZ, 0F BERLIN-WIILM'ERSDORI', GERMANY, ASSIGNOR TO- AC'IIEN GE- 'SELIJSGIHAFT FU'IR- ANILIN FABRIKATIQN, 0F BERLIN, GERMANY.

PROCESS FOR DYEING FURS, SKINS, HAIRS, FEATHERS, OR THE LIKE.

' No Drawing.

To all whom it may concern:

Be it known that I, PAUL ONNERTZ, a citizen of the German Republic, residing at Berlin-Wilmersdorf, Germany, have invent- 5 ed certain new and useful Improvements in 2o ing.

The following example illustrates the invention:

The well-washed skin is handled for some hours in a mordanting bath containing per 25 litre I 2 grams of potassium bichromate 0.25 gram of crystallized copper sulfate 2 grams of acetic acid of 30 per cent strength a 30 01 Application filed November 22, 1924. Serial No. 751,676.

4 grams of crystallized copper sulfate 2 grams of aoetic'acid strength or -2 grams of acetic strength.

of 30 per cent 4 grams of crystallized ferrous sulfate acid of 30 per cent The mordanted skin is handled for 4 hours in a batlrcontaining per litre 2 grams of 4- ohloro-1.2-diaminobenzene and 20 grams of hydrogen peroxide solution (of about 3 per cent strength), at ordinary temperature. The skin 1s then well washed and finished as usual.

Having now particularly described and ascertained the nature of my invention and in what manner the same is to be performed,

I declare that what I A process for dye feathers or the like claim is,-- mg furs, skins, hairs consistlng in treating the material to be dyed with a solution of 4-chloro-1.Q-diaminobenzene in the presence of an oxidizing agent.

In testimony whereof I ailix my signature in presence of two witnesses.

"Witnesses:

WLAD ENDERY, Ror J. Fox.

PAUL ON N ERTZ. 

